To convert between pounds and ounces in the standard system, use a factor of 16. Multiply the weight in pounds by 16. Ounces to Pounds: Divide the weight in ounces by 16. Common Household Equivalents Knowing these can help you estimate weight without a scale: 1 Ounce: Roughly the weight of a single slice of bread.
Roughly the weight of a football or a 16-ounce bottle of water . History of the Units
16 ounces per pound. Used for food, people, and general trade.
Converting pounds to ounces (video) - Khan Academy
There are two main systems currently used in the U.S. and UK: